1. 16 [1] 16 United States Code Annotated § 1531(a) (2009) Thomson/Westlaw, New York
2. Piaget J (1952) The origins of intelligence in children. Norton, New York
3. Piaget J (1960) The child’s conception of the world. Adams, Littlefield, NJ
4. Vaknin S (2005) Malignant self love: narcissism revisited. Lidija Rangelovska Narcissus Publications, Macedonia
5. Morris C (1996) Psychology – an introduction, 9th edn. Prentice Hall, Englewood Cliffs, NJ